[whatwg] Video : Slow motion, fast forward effects

Maik Merten maikmerten at googlemail.com
Thu Aug 7 01:28:02 PDT 2008

Chris Double schrieb:
> Given that codecs are often highly optimized for forward playback the
> cost in memory can be excessive to go the other way. Could there be a
> possibility to say 'reverse playback not supported'?

This may be needed anyway, given that with streaming media you can't 
reverse playback, even if the codec would allow it easily (which is not 
the case for MPEG, VC-1, Theora, Dirac, <your favorite codec here>).

An interesting case would also be how to handle playback speeds smaller 
than "1x" in the streaming case, given that you cannot possibly have an 
infinite buffer of input data. Streaming mostly forces a playback speed 
of "+1x" in all cases.


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